Behold, I and the children whom the LORD has given me are for signs and for wonders in Israel from the LORD of hosts, who dwells in mount Zion.
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First it must be noted that Matthew’s Gospel uses the text of the Septuagint, not the Hebrew: “Jesus, hearing that John had been handed over, departed to Galilee. Leaving Nazareth, he came and lived in Capernaum, which is near the sea at the end of Zebulun and Naphtali. This was to fulfill what was said through the prophet Isaiah: ‘In the land of Zebulun and Naphtali, by the way of the sea across the Jordan in Galilee of the Gentiles, the people who sat in darkness have seen a great light; upon those who sat in the region of the shadow of death a light has dawned.’ From that moment, Jesus began to preach and to say, ‘The kingdom of heaven approaches.’ ” And the evangelist John reports that Jesus performed his first sign, changing water into wine, when he was invited to attend a wedding in Cana with his disciples: “Jesus performed the first of his signs in Cana of Galilee and revealed his glory, and his disciples believed in him.” Hence, the Septuagint reads, “Drink this first and do it...
Not only do we become his brothers but even his children, for he says, “Behold, I and my children, whom God has given me.” Not only do we become his children but also his members and his body. As if the things already mentioned were not enough to prove the love and kindness that he shows toward us, he set down another thing, greater and more intimate than these, when he spoke of himself as our head. - "Baptismal Instructions 12.14 (2.2)"